feat: Update CPython 3.15.0 from -a8 to -rc1. (#4122)

Most users will want -rc1 to build ABI stable wheels.

---------

Co-authored-by: Richard Levasseur <richardlev@gmail.com>
diff --git a/news/4122.changed.md b/news/4122.changed.md
new file mode 100644
index 0000000..3c6173f
--- /dev/null
+++ b/news/4122.changed.md
@@ -0,0 +1,2 @@
+(toolchain) Updated default Python 3.15 runtime from `3.15.0a8` to `3.15.0rc1`
+([#4122](https://github.com/bazel-contrib/rules_python/pull/4122)).
diff --git a/python/private/runtimes_manifest.txt b/python/private/runtimes_manifest.txt
index df02a30..aad38ef 100755
--- a/python/private/runtimes_manifest.txt
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index c2da00a..0000ae7 100644
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+e9fa3fb6532f9d0c67a79fc4d529a4ab148fe3af4d4e2c0d10d03613f4dfd4aa  20260804/cpython-3.15.0rc1+20260804-x86_64-apple-darwin-install_only.tar.gz
+b57ebc21dc3b8f62b451abd1928f32fc85e1b80ca09f521884f25c61e431b0cf  20260804/cpython-3.15.0rc1+20260804-x86_64-pc-windows-msvc-freethreaded-install_only.tar.gz
+432e8a054f9eb0338a905f22165e9e19a22446887af745bd756d12633f501404  20260804/cpython-3.15.0rc1+20260804-x86_64-pc-windows-msvc-install_only.tar.gz
+974305be0fe81e08f2f96c353855bd21e1cd50acd957f0bdfc7ea07f31f73b03  20260804/cpython-3.15.0rc1+20260804-x86_64-unknown-linux-gnu-freethreaded-install_only.tar.gz
+0c56bcd9a9ed031e6715c1214261e0c716de1689ddf242b3f3c14840b97deca0  20260804/cpython-3.15.0rc1+20260804-x86_64-unknown-linux-gnu-install_only.tar.gz
+8501e096a178203d919ec201d33afcc30c0afe5bc7bdb03d5909040ab153ea31  20260804/cpython-3.15.0rc1+20260804-x86_64-unknown-linux-musl-freethreaded-install_only.tar.gz
+23231f3635a8436322c4ea4c2d37a9982a3aeba3ae37924ce03cf0cd9216827e  20260804/cpython-3.15.0rc1+20260804-x86_64-unknown-linux-musl-install_only.tar.gz
 """
diff --git a/python/versions.bzl b/python/versions.bzl
index 6e3efb3..60fe35b 100644
--- a/python/versions.bzl
+++ b/python/versions.bzl
@@ -49,7 +49,7 @@
     "3.12": "3.12.13",
     "3.13": "3.13.13",
     "3.14": "3.14.4",
-    "3.15": "3.15.0a8",
+    "3.15": "3.15.0rc1",
 }
 
 def _generate_platforms():
diff --git a/tests/support/mocks/python_ext.bzl b/tests/support/mocks/python_ext.bzl
index dc3ac41..4c68e87 100644
--- a/tests/support/mocks/python_ext.bzl
+++ b/tests/support/mocks/python_ext.bzl
@@ -108,7 +108,7 @@
 9999999999999999999999999999999999999999999999999999999999999999  20241016/cpython-3.13.0+20241016-x86_64-unknown-linux-gnu-install_only.tar.gz
 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa  20260414/cpython-3.14.4+20260414-x86_64-unknown-linux-gnu-install_only.tar.gz
 bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb  20251031/cpython-3.14.0+20251031-x86_64-unknown-linux-gnu-install_only.tar.gz
-cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc  20260414/cpython-3.15.0a8+20260414-x86_64-unknown-linux-gnu-install_only.tar.gz
+cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc  20260804/cpython-3.15.0rc1+20260804-x86_64-unknown-linux-gnu-install_only.tar.gz
 dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd  20241205/cpython-3.13.1+20241205-x86_64-unknown-linux-gnu-install_only.tar.gz
 """